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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8759d23836a7b756cdf81977dce1824120864204190d9d9a76032443a76982c' 
  AND token = 'bYT8fNtBe2VvasRaQ2+Vc98Ft3hpygeizQow5T2i598=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}